# 用控制台打印圆形
'''
     **
  *      *
 *        *		
 *        *
  *      *
     **
'''

R = 10
for i in range(R * 2 + 1):
    print(round((R - (R ** 2 - (R - i) ** 2) ** (1 / 2))) * "  " + "*" + round(
        (((R ** 2 - (R - i) ** 2) ** (1 / 2)) * 2)) * "  " + "*")
